A converging lens produces an image of an object $$\(O\)$$. The focal length of the lens is $$\(f\)$$. Which position of the object produces a virtual image?
A.
B.
C.
D.
Exam No：0625_w19_qp_21 Year：2019 Question No：23
Answer:
A
Knowledge points:
3.1.1 Demonstrate understanding that waves transfer energy without transferring matter
3.1.10 Describe how wavelength affects diffraction at an edge
3.1.2 Describe what is meant by wave motion as illustrated by vibration in ropes and springs and by experiments using water waves
3.1.3 Use the term wavefront
3.1.4 Give the meaning of speed, frequency, wavelength and amplitude
3.1.5 Distinguish between transverse and longitudinal waves and give suitable examples
3.1.6.1 reflection at a plane surface
3.1.6.2 refraction due to a change of speed
3.1.6.3 diffraction through a narrow gap
3.1.7 Describe the use of water waves to demonstrate reflection, refraction and diffraction
3.1.8 Recall and use the equation v =f λ
3.1.9 Describe how wavelength and gap size affects diffraction through a gap
Solution:
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